On my Gen 4 Glock 21, the fit is great, they look awesome, and I havent had any feeding issues. I definitely recommend these.

- Justin Smith, TN

Works like a charm...

Bought two extenders to add a couple of rounds to my 13 round .45 magazines and they performed flawlessly. Not a single malfunction through 200 shots and as an added bonus the increased length of the magazine aids in a slightly steadier hold.